For Those About To Rock 3d (Import) Dimension: 45mm Make: Zinc Alloy. 2 Tone Plating. - Our Metal Key Chains Come In A Variety Of Shapes, Sizes And Styles. Some Are Made Of Polished Aluminum, While Others Are Made Of Polished Casted Pewter. Some Are Filled With Brightly Colored Enamel, While Others Are All Silver Metal. All Key Chains Come Equipped With A Sturdy Chrome Plated Key Ring.